Battery cover plate structure, battery shell and battery cell

Abstract

The present invention relates to the technical field of power batteries, and provides a battery cover plate structure, a battery shell and a battery cell, the battery cover plate structure comprises: a cover plate body having two opposite plate surfaces, one of which forms a support surface; the pole hole penetrates through the two plate surfaces of the cover plate body; the supporting boss protrudes out of the supporting surface, and the height of the supporting boss protruding out of the supporting surface is larger than or equal to the preset height; the orthographic projection area S1 of the supporting boss on the supporting surface meets the condition that S1 is larger than or equal to 0.4 S and smaller than or equal to 0.75 S; wherein the preset height is the height of the electrode structure protruding out of the supporting surface, and S is the area of the supporting surface. By means of the arrangement, impact external force borne by the electrode structure can be reduced or even avoided, meanwhile, the problem of stress concentration deformation caused by insufficient area of the supporting bosses is solved, the supporting effect of the electrode structure is guaranteed, the short-circuit risk of the battery cell caused by direct stress of the electrode structure is effectively reduced, and long-term stable operation of the battery cell is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a battery cover structure, battery casing and battery cell. Background Technology

[0002] With the rapid development of new energy technologies, power batteries, as core components in electric vehicles, energy storage systems and other fields, are facing increasingly higher requirements for performance and safety. The battery cell is the basic unit of the power battery, undertaking the functions of storing and releasing electrical energy.

[0003] In traditional battery cell structures, the terminal post is the connection carrier between the internal electrodes of the battery cell and the external circuit. It is usually integrated on the battery cover and protrudes outward from the outer surface of the battery cover to form a boss-shaped or columnar structure, so as to facilitate subsequent assembly and connection with external components such as the battery pack's terminals and busbars.

[0004] However, actual research has found that the electrode structure formed after welding the electrode post to the electrode plate constitutes the highest point of the cell. When the upper surface of the entire battery pack is subjected to external force, the impact force will directly act on the electrode structure, which can easily cause the risk of short circuit in the cell, and the safety and stability of the battery operation cannot be guaranteed.

[0005] In view of the above problems, how to reduce the impact of external shocks on the electrode structure, thereby reducing the risk of short circuits in the battery cell and ensuring the long-term stable operation of the battery cell, has become an important technical problem that urgently needs to be solved. Summary of the Invention

[0006] This invention provides a battery cover structure, a battery casing, and a battery cell to address the shortcomings of existing technologies where external impacts on the entire battery pack directly affect the battery cell, potentially leading to short circuit risks. It effectively reduces the impact of external forces on the electrodes, thereby lowering the risk of short circuits in the battery cell and ensuring its long-term stable operation.

[0007] This invention provides a battery cover structure, comprising: The cover plate body has two opposing plate surfaces, and one of the plate surfaces is formed as a support surface; The pole hole penetrates both surfaces of the cover plate body; A support boss protrudes from the support surface, and the height of the protrusion from the support surface is greater than or equal to a preset height; the orthographic projection area S1 of the support boss on the support surface satisfies: 0.4S≤S1≤0.75S; Wherein, the preset height is the height by which the electrode structure protrudes from the support surface, and S is the area of ​​the support surface.

[0008] According to a battery cover structure provided by the present invention, the length L1 of the supporting boss satisfies: 0.35L ≤ L1 ≤ 0.85L, where L is the length of the supporting surface; and / or, The width W1 of the support boss satisfies: 0.5W≤W1≤0.9W; where W is the width of the support surface.

[0009] According to a battery cover structure provided by the present invention, the length L of the cover body satisfies: 120mm ≤ L ≤ 350mm; and / or, The width W of the cover plate body satisfies: 22mm≤L≤85mm.

[0010] According to a battery cover structure provided by the present invention, the height H2 of the supporting boss protruding from the supporting surface satisfies: (0.8mm+H1)≤H2≤(2.5mm+H1); where H1 is the height of the pole protruding from the supporting surface.

[0011] According to a battery cover structure provided by the present invention, the height H2 of the supporting boss protruding from the supporting surface also satisfies: H2 / T≤3.0; where T is the thickness of the cover body.

[0012] According to a battery cover structure provided by the present invention, the thickness T of the cover body satisfies: 1.5mm ≤ T ≤ 3mm; and / or, The wall thickness t of the supporting boss satisfies: 1.0mm≤t≤2.5mm.

[0013] According to a battery cover structure provided by the present invention, a supporting boss is provided, and the geometric center of the supporting boss coincides with the geometric center of the supporting surface; The pole post hole is provided in two places, and the two pole post holes are located on both sides of the support boss along the length direction of the support surface.

[0014] According to a battery cover structure provided by the present invention, the cover body and the supporting boss are integrally formed by manganese-aluminum alloy.

[0015] According to a battery cover structure provided by the present invention, the supporting boss has an integrated liquid injection hole.

[0016] The present invention also provides a battery housing, including a housing component and a battery cover structure as described in any of the above claims connected to one end of the housing component; The cover plate body is integrally formed on one end of the housing component, and the opposite end of the housing component is set as an open opening.

[0017] According to a battery casing provided by the present invention, a base plate is welded to the opening, and an explosion-proof valve is integrated on the base plate.

[0018] The present invention also provides a battery cell, and the present invention further provides a battery casing including an electrode assembly and a battery casing for accommodating the electrode assembly as described in any one of the above claims; It also includes an electrode structure passing through the electrode post hole, one end of which is connected to the electrode lug of the electrode group, and the other end protruding from the support surface at a preset height; the height of the support boss protruding from the support surface is greater than or equal to the preset height.

[0019] The battery cover structure, battery casing, and battery cell provided by this invention, after being assembled into a battery casing using the aforementioned battery cover structure, have the electrode post protruding through the electrode post hole and together with the support boss protruding from the support surface, i.e. protruding outwards towards the cavity of the battery casing. After the electrode post is welded with a tab to form an electrode structure, the height of the support boss protruding from the support surface is greater than or equal to the height of the electrode structure protruding from the support surface. In this way, the support boss forms the highest point or one of the highest points on the upper surface of the battery cell. When the upper surface of the entire battery pack is subjected to an external force impact, the impact force will be partially or completely absorbed by the support boss, thereby reducing or even avoiding the impact force on the electrode structure.

[0020] Meanwhile, the area S1 of the orthographic projection of the support boss on the support surface satisfies 0.4S≤S1≤0.75S. If S1<0.4S, the area of ​​the support boss is insufficient. When the battery pack is subjected to external impact, the stress on the support boss is too large, and it is easy to deform due to stress concentration, which affects its support effect. If S1>0.75, the area of ​​the support boss is too large, and the remaining space on the support surface cannot meet the current requirements of the pole. By ensuring that 0.4S≤S1≤0.75S, it is possible to ensure that the remaining space on the support surface meets the current requirements of the pole, and also to effectively disperse stress, reduce the problem of deformation of the support boss under stress, and ensure the support effect of the support boss.

[0021] Compared to related technologies, by setting a support boss on the support surface with a protrusion height greater than or equal to the protrusion height of the electrode structure, and ensuring that the area S1 of the orthographic projection of the support boss on the support surface satisfies 0.4S≤S1≤0.75S, the impact force on the electrode structure can be reduced or even avoided. At the same time, the deformation problem caused by insufficient area and stress concentration of the support boss can be reduced, ensuring its support effect. This effectively reduces the risk of cell short circuit caused by direct force on the electrode structure and ensures the long-term stable operation of the cell. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the battery casing provided in an embodiment of the present invention.

[0024] Figure 2 This is one of the structural schematic diagrams of the battery cell provided in the embodiments of the present invention.

[0025] Figure 3 This is the second schematic diagram of the battery cell provided in the embodiment of the present invention.

[0026] Figure 4 This is a top view of the battery casing provided in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of the base plate and the housing component provided in an embodiment of the present invention.

[0028] Figure label: 11. Cover plate body; 110. Support surface; 12. Pole post hole; 13. Support boss; 14. Injection hole; 20. Housing component; 21. Base plate; 22. Explosion-proof valve; 23. Pole post. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0030] To better understand the battery cover structure, battery casing, and battery cell provided in the embodiments of the present invention, we will first introduce its application background. The battery cell is the basic component of a power battery, which undertakes the functions of storing and releasing electrical energy. In the traditional battery cell structure, the terminal post is the connection carrier between the internal electrode of the battery cell and the external circuit. It is usually integrated on the battery cover and protrudes outward from the outer surface of the battery cover to form a boss-shaped or columnar structure, so as to facilitate subsequent assembly and connection with external components such as the battery pack's terminals and busbars.

[0031] However, actual research has found that the electrode structure formed after welding the electrode post to the electrode plate constitutes the highest point of the cell. When the upper surface of the entire battery pack is subjected to external force, the impact force will directly act on the electrode structure, which can easily cause the risk of short circuit in the cell, and the safety and stability of the battery operation cannot be guaranteed.

[0032] In view of the above problems, embodiments of the present invention provide a battery cover structure, a battery casing and a battery cell, which can effectively reduce the impact of external impact forces on the electrode structure, reduce the risk of short circuit in the battery cell and ensure the long-term stable operation of the battery.

[0033] The following is combined with Figures 1 to 5 The present invention describes the battery cover structure, battery casing, and battery cell.

[0034] Reference Figures 1 to 3 A battery cover structure includes a cover body 11, an electrode post hole 12, and a support boss 13. The cover body 11 has two opposing plates, one of which is formed as a support surface 110. The electrode post hole 12 penetrates both plates of the cover body 11. The support boss 13 protrudes from the support surface 110, and the height of the support boss 13 protruding from the support surface 110 is greater than or equal to a preset height, and its orthogonal projection area S1 on the support surface 110 satisfies: 0.4S≤S1≤0.75S. The preset height is the height of the electrode structure protruding from the support surface 110, and S is the area of ​​the support surface 110.

[0035] In practical applications, after the battery cover structure described above is assembled into a battery casing, the electrode post 23 protrudes through the electrode post hole 12 and together with the support boss 13 protrudes from the support surface 110, that is, protrudes outward toward the cavity of the battery casing. After the electrode post 23 is welded with a tab to form an electrode structure, the height of the support boss 13 protruding from the support surface 110 is greater than or equal to the height of the electrode structure protruding from the support surface 110. In this way, the support boss 13 forms the highest point or one of the highest points on the upper surface of the cell. When the upper surface of the entire battery pack is impacted by an external force, the impact force will be partially or completely absorbed by the support boss 13, thereby reducing or even avoiding the impact force on the electrode structure.

[0036] Meanwhile, the area S1 of the orthographic projection of the support boss 13 onto the support surface 110 satisfies 0.4S≤S1≤0.75S. If S1<0.4S, the area of ​​the support boss 13 is insufficient. When the battery pack is subjected to external impact, the stress on the support boss 13 is too large, and it is easy to deform due to stress concentration, affecting its support effect. If S1>0.75, the area of ​​the support boss 13 is too large, and the remaining space on the support surface 110 cannot meet the current requirements of the pole 23. By ensuring that 0.4S≤S1≤0.75S, it is possible to ensure that the remaining space on the support surface 110 meets the current requirements of the pole 23, and to effectively disperse stress, reduce the problem of deformation of the support boss 13 under stress, and ensure the support effect of the support boss 13.

[0037] Compared with related technologies, by setting a support boss 13 on the support surface 110 with a protrusion height greater than or equal to the protrusion height of the electrode structure, and ensuring that the area S1 of the orthographic projection of the support boss 13 on the support surface 110 satisfies 0.4S≤S1≤0.75S, the impact force on the electrode structure can be reduced or even avoided. At the same time, the deformation problem caused by insufficient area and stress concentration of the support boss 13 can be reduced, ensuring its support effect. This effectively reduces the risk of cell short circuit caused by direct force on the electrode structure and ensures the long-term stable operation of the cell.

[0038] In addition to the technical effects mentioned above, the support boss 13 can also increase the heat dissipation area of ​​the electrode. As a load-bearing component, the cold patch component can be placed on the support boss 13 in the Pack, so that the water cooling equipment of the Pack can directly act on the terminal post 23, thereby reducing the temperature of the electrode under battery charging and discharging conditions and improving the fast charging performance of the cell.

[0039] It is understandable that the cover plate body 11, as the supporting foundation for various components, can have its shape, size, and material parameters selected and designed according to actual needs, such as the shape, size specifications, and strength requirements of the battery cell.

[0040] In one example of the present invention, the cover plate body 11 is a rectangular plate made of manganese-aluminum alloy with a yield strength R ≥ 125 MPa.

[0041] The cover plate body 11 has two plate surfaces in its thickness direction. After the battery housing is assembled using the cover plate body 11, one of the plate surfaces faces the inner side of the housing cavity, and the other plate surface faces the outer side of the housing cavity. The side of the cover plate body 11 facing the outer side of the housing cavity is formed as the aforementioned support surface 110.

[0042] The terminal hole 12 penetrates both surfaces of the cover plate body 11, so that after the terminal 23 passes through the terminal hole 12, one end can be located inside the battery housing cavity and connected to the electrode tab of the electrode group, and the other end protrudes out of the battery housing cavity (i.e. protruding from the support surface 110) to lead out current. The tab is welded to the end of the terminal 23 that protrudes out of the battery housing cavity to form the electrode structure of the cell. The support boss 13 protrudes out of the support surface 110 to bear the impact force on the entire battery pack.

[0043] In some optional examples of the present invention, there may be one or more support bosses 13. The support bosses 13 may be rectangular, circular, or other sizes or irregular polygons. In addition, the length, width, height and other parameters of the support bosses 13 need to be further designed according to the support strength requirements, which will be described in detail below and will not be introduced here.

[0044] To give a further example, when there is one support boss 13, its geometric center coincides with the geometric center of the support surface 110. When there are two or more support bosses 13, they are arranged symmetrically about the long side centerline of the support surface 110. In this way, it can be ensured that when the support boss 13 is under force, the force is evenly distributed to the entire cover plate body 11, ensuring balanced force distribution and improving the structural stability and load-bearing capacity of the support boss 13.

[0045] In a specific example of the present invention, a support boss 13 is provided. The support boss 13 has a rectangular structure and is symmetrical about the midline of the long side and the midline of the short side of the support surface 110, thereby placing it at the geometric center of the support surface 110. In addition, in order to ensure the integrity and strength of the structure, the support boss 13 is integrally formed on the cover plate body 11, for example, by stamping.

[0046] With this configuration, the rectangular support boss 13 can be adapted to the shape of the support surface 110, thereby maximizing the use of the space on the support surface 110. The integral molding method ensures the structural integrity and strength of the battery cover, guaranteeing the load-bearing capacity of the support boss 13. The symmetrical arrangement of the structure allows the impact force to be evenly distributed to the entire cover body 11 when the support boss 13 is under force, ensuring balanced force distribution, reducing deformation caused by localized force, and further improving the structural stability and load-bearing capacity of the support boss 13.

[0047] Furthermore, two electrode holes 12 are provided, located on both sides of the support boss 13 along the length of the support surface 110. An injection hole 14 is integrated on the support boss 13, located at the geometric center of the support boss 13. This allows the support boss 13 to perform multiple functions, including support and electrolyte injection, avoiding interference and maximizing space utilization.

[0048] It is understandable that the height of the support boss 13 protruding from the support surface 110 can be equal to the height of the electrode structure protruding from the support surface 110. In this case, part of the external force on the entire battery pack is borne by the support boss 13, thereby reducing the external force acting on the electrode structure and reducing the risk of short circuit caused by the force on the electrode structure.

[0049] To further enhance the protective effect of the support boss 13 on the electrode structure, in this embodiment, the height of the support boss 13 protruding from the support surface 110 is greater than the height of the electrode structure protruding from the support surface 110. With this configuration, all impact forces on the entire battery pack can be absorbed by the support boss 13, thereby avoiding the short-circuit risk caused by external forces directly acting on the electrode structure.

[0050] In a further example of the present invention, reference is made to Figure 3 The height H2 of the support boss 13 protruding from the support surface 110 and the height H1 of the electrode post 23 protruding from the support surface 110 satisfy: (0.8mm+H1)≤H2≤(2.5mm+H1). This setting allows for sufficient height difference redundancy, ensuring that the height of the support boss 13 is slightly higher than the total height of the electrode post 23 after welding the tabs, that is, ensuring that the height of the support boss 13 protruding from the support surface 110 is higher than the height of the electrode structure protruding from the support surface 110, thus avoiding impact forces acting on the electrode structure.

[0051] In a further example of the present invention, the height H2 of the support boss 13 protruding from the support surface 110 and the thickness T of the cover plate body 11 satisfy: H2 / T ≤ 3.0. With this setting, if the H2 / T ratio exceeds 3.0, it means that the protrusion height of the support boss 13 is much greater than the thickness of the cover plate body 11. It is not easy to ensure the wall thickness of the support boss 13 during stamping, resulting in insufficient strength of the support boss 13. In addition, if the height of the support boss 13 is too high, it is easy to have problems such as root stress concentration and bending deformation when under force, affecting the load-bearing capacity of the support boss 13.

[0052] In detail, the thickness of the cover plate body 11 is 1.5mm≤T≤3mm, and the wall thickness of the supporting boss 13 is 1.0mm≤T≤2.5mm.

[0053] In a further example of the present invention, reference is made to Figure 4 The length L1 of the supporting boss 13 satisfies: 0.35L≤L1≤0.85L; where L is the length of the supporting surface 110.

[0054] This configuration ensures that the projected area S1 of the support boss 13 on the support surface 110 meets the requirements, and also allows sufficient space to be reserved on both sides of the support boss 13 along the long side of the support surface 110 to arrange the pole hole 12, thus meeting the flow requirements of the pole 23.

[0055] In a further example of the present invention, the width W1 of the support boss 13 satisfies: 0.5W≤W1≤0.9W; where W is the width of the support surface 110.

[0056] This configuration ensures that the projected area S1 of the support boss 13 on the support surface 110 meets the requirements, provides sufficient operating space for the processing of the support boss 13, and avoids the support boss 13 from getting too close to the edge of the cover plate body 11, thus ensuring the structural strength of the edge of the support boss 13.

[0057] In detail, the length L of the cover plate body 11 satisfies: 120mm≤L≤350mm, and the width W of the cover plate body 11 satisfies: 22mm≤L≤85mm.

[0058] To verify the effectiveness of the above scheme, different DOEs were arranged for the parameter value range provided in the embodiments of the present invention, and the results are shown in Table 1.

[0059] Table 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 L 160 200 240 260 280 350 122 135 300 320 W 35 40 45 50 55 85 22 30 60 70 <![CDATA[H1]]> 2 2.3 2.5 2.8 3 3.5 1.5 1.8 3.2 3.2 <![CDATA[H2]]> 2.9 3.2 4.6 5 5 6 2.3 2.5 5.5 6 <![CDATA[H2-H1]]> 0.90 0.90 2.10 2.20 2.00 2.50 0.80 0.70 2.30 2.80 T 1.80 2.00 2.20 2.40 2.50 3.00 1.50 1.60 2.60 2.80 S 5600 8000 10800 11000 15400 29750 2684 4050 18000 22400 <![CDATA[L1]]> 80 100 120 160 180 290 45 50 220 255 <![CDATA[W1]]> 30 40 50 55 60 75 15 20 65 70 <![CDATA[S1]]> 2400.00 4000.00 6000.00 8800.00 10800.0 21750.0 675.0 1000.0 14300.0 17850.0 <![CDATA[S1 / S]]> 0.43 0.50 0.56 0.68 0.70 0.73 0.25 0.25 0.79 0.80 F(N) 100000 100000 100000 100000 100000 100000 100000 100000 100000 100000 <![CDATA[1.3F / S1]]> 54.17 32.5 21.67 14.77 12.04 5.98 192.60 130 9.10 7.29 Verification effect PACK simulation analysis showed that when the battery pack was subjected to a mechanical impact force of magnitude F along the thickness direction of the cover plate body 11, the stress values ​​of the materials on the upper surface of the supporting boss 13 and the upper surface of the aluminum sheet did not increase significantly. PACK simulation analysis showed that when the battery pack was subjected to a mechanical impact force of magnitude F along the thickness direction of the cover plate body 11, the stress values ​​of the materials on the upper surface of the supporting boss 13 and the upper surface of the aluminum sheet did not increase significantly. PACK simulation analysis showed that when the battery pack was subjected to a mechanical impact force of magnitude F along the thickness direction of the cover plate body 11, the stress values ​​of the materials on the upper surface of the supporting boss 13 and the upper surface of the aluminum sheet did not increase significantly. PACK simulation analysis showed that when the battery pack was subjected to a mechanical impact force of magnitude F along the thickness direction of the cover plate body 11, the stress values ​​of the materials on the upper surface of the supporting boss 13 and the upper surface of the aluminum sheet did not increase significantly. PACK simulation analysis showed that when the battery pack was subjected to a mechanical impact force of magnitude F along the thickness direction of the cover plate body 11, the stress values ​​of the materials on the upper surface of the supporting boss 13 and the upper surface of the aluminum sheet did not increase significantly. PACK simulation analysis showed that when the battery pack was subjected to a mechanical impact force of magnitude F along the thickness direction of the cover plate body 11, the stress values ​​of the materials on the upper surface of the supporting boss 13 and the upper surface of the aluminum sheet did not increase significantly. <![CDATA[1.3F / S1 > R value. After PACK simulation analysis, when the battery pack is subjected to a mechanical impact force of F along the thickness direction of the cover body 11, the stress value of the material on the upper surface of the support boss 13 increases by about 5.5%.]]> <![CDATA[1.3F / S1 > R value. After PACK simulation analysis, when the battery pack is subjected to a mechanical impact force of F along the thickness direction of the cover body 11, the stress value of the material on the upper surface of the support boss 13 increases by about 4.5%]]> Although the material stress value did not increase significantly, the area of ​​the support boss 13 was relatively high, compressing the space of the pole and reducing the product's current carrying capacity, resulting in a serious design imbalance. Although the material stress value did not increase significantly, the area of ​​the support boss 13 was relatively high, compressing the space of the pole and reducing the product's current carrying capacity, resulting in a serious design imbalance. in conclusion This indicates that no deformation occurred after being subjected to force. This indicates that no deformation occurred after being subjected to force. This indicates that no deformation occurred after being subjected to force. This indicates that no deformation occurred after being subjected to force. This indicates that no deformation occurred after being subjected to force. This indicates that no deformation occurred after being subjected to force. This indicates that deformation occurs after being subjected to force. This indicates that deformation occurs after being subjected to force. Based on the above test results, when a support boss 13 is added to the cover plate body 11, and the support boss 13 meets the above design requirements, when the battery pack is subjected to a mechanical impact force of magnitude F along the thickness direction of the cover plate body 11, the upper surface of the support boss 13 and the upper surface of the cover plate body 11 do not undergo significant deformation, and the structural strength of the support boss 13 and the cover plate body 11 meets the stress requirements. When the area of ​​the support boss 13 is insufficient, resulting in 1.3F / S1 > R, according to PACK simulation analysis, when the battery pack is subjected to a mechanical impact force of magnitude F along the thickness direction of the cover plate body 11, the stress value of the material on the upper surface of the support boss 13 increases, indicating that the force on the support boss 13 exceeds its yield strength and no longer meets the stress requirements; when 1.3F / S1 is much smaller than R, it indicates that the area occupied by the support boss 13 is too large, and the remaining space on the support surface 110 cannot meet the current requirements of the terminal post 23.

[0060] The battery housing provided by the present invention is described below. The battery housing described below can be referred to in correspondence with the battery cover structure described above.

[0061] Reference Figures 1 to 5 A battery housing includes a housing member 20 and a battery cover structure provided in any of the above examples connected to the housing member 20.

[0062] In detail, the support surface 110 of the cover body 11 is located outside the cavity of the housing 20, and the support boss 13 is formed on the support surface 110 and protrudes in a direction away from the cavity of the housing 20.

[0063] It is understandable that the housing component 20 and the cover plate body 11 can be fixed by welding using conventional processes, including but not limited to laser welding, resistance welding, etc.

[0064] However, in practical applications, it has been found that when the entire battery pack is subjected to external impact, the cover plate body 11 will be stressed, which may cause cracks in the welding surface between it and the shell part 20. This not only affects the connection strength between the two, but may also damage the sealing performance of the battery cell, leading to safety hazards such as electrolyte leakage and battery cell short circuit.

[0065] In view of the above problems, in a further example of the present invention, the cover plate body 11 is integrally formed on one end of the housing part 20, and the other end of the housing part 20 is set as an open opening. This configuration eliminates the weld seam between the side wall and the upper cover in the traditional welded housing, effectively avoiding cracking problems caused by excessive external impact or long-term load, ensuring the overall structural strength of the housing assembly, reducing safety hazards such as electrolyte leakage and cell short circuit, and ensuring the long-term stable operation of the cell.

[0066] It is understandable that the forming methods of the cover plate body 11 and the housing part 20 include, but are not limited to, stamping forming, integral molding forming, etc.

[0067] In more detail, the battery casing also includes a base plate 21, which is fixedly connected to the open end of the casing component 20 by welding. An explosion-proof valve 22 is installed on the base plate 21. This configuration enables thermal and electrical separation, preventing the impact of high-temperature gases, flames, corrosive electrolytes, and other high-temperature ejected materials on the battery cell during thermal runaway, thereby avoiding safety risks caused by secondary short circuits or heat propagation during thermal runaway.

[0068] The battery cell provided by the present invention is described below. The battery cell described below can be referred to in correspondence with the battery casing described above.

[0069] A type of battery cell, reference Figure 2 and Figure 3 It includes an electrode assembly and a battery housing provided in any of the above examples for accommodating the electrode assembly; it also includes an electrode structure passing through the electrode post hole 12, wherein the height of the support boss 13 protruding from the support surface 110 is greater than or equal to the height of the electrode structure protruding from the support surface 110.

[0070] In detail, the electrode structure includes an electrode post 23 and a plate; wherein, the electrode post 23 is inserted through the electrode post hole 12, and the plate is welded to one end of the electrode post 23 that protrudes from the support surface 110.

[0071] The battery cover structure, housing, and cell provided by the embodiments of the present invention, by setting a support boss 13 on the support surface 110 with a protrusion height greater than or equal to the protrusion height of the electrode structure, and ensuring that the area S1 of the orthographic projection of the support boss 13 on the support surface 110 satisfies 0.4S≤S1≤0.75S, can reduce or even avoid the impact force on the electrode structure, while reducing the stress concentration deformation problem caused by insufficient area of ​​the support boss 13, ensuring its support effect, effectively reducing the risk of cell short circuit caused by direct force on the electrode structure, and ensuring the long-term stable operation of the cell.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cover structure, characterized in that, include: The cover body (11) has two opposing plate surfaces, and one of the plate surfaces is formed as a support surface (110). The pole hole (12) penetrates both surfaces of the cover plate body (11); A support boss (13) is provided protruding from the support surface (110), and the height of the protrusion from the support surface (110) is greater than or equal to a preset height; the orthogonal projection area S1 of the support boss (13) on the support surface (110) satisfies: 0.4S≤S1≤0.75S; Wherein, the preset height is the height of the electrode structure protruding from the support surface (110), and S is the area of ​​the support surface (110).

2. The battery cover structure according to claim 1, characterized in that, The length L1 of the supporting boss (13) satisfies: 0.35L ≤ L1 ≤ 0.85L, where L is the length of the supporting surface (110); and / or, The width W1 of the support boss (13) satisfies: 0.5W≤W1≤0.9W; where W is the width of the support surface (110).

3. The battery cover structure according to claim 2, characterized in that, The length L of the cover plate body (11) satisfies: 120mm ≤ L ≤ 350mm; and / or, The width W of the cover plate body (11) satisfies: 22mm≤L≤85mm.

4. The battery cover structure according to claim 1, characterized in that, The height H2 of the support boss (13) protruding from the support surface (110) satisfies: (0.8mm+H1)≤H2≤(2.5mm+H1); where H1 is the height of the pole post (23) protruding from the support surface (110).

5. The battery cover structure according to claim 4, characterized in that, The height H2 of the support boss (13) protruding from the support surface (110) also satisfies: H2 / T≤3.0; where T is the thickness of the cover plate body (11).

6. The battery cover structure according to claim 5, characterized in that, The thickness T of the cover plate body (11) satisfies: 1.5mm ≤ T ≤ 3mm; and / or, The wall thickness t of the supporting boss (13) satisfies: 1.0mm≤t≤2.5mm.

7. The battery cover structure according to any one of claims 1 to 6, characterized in that, The support boss (13) is provided, and the geometric center of the support boss (13) coincides with the geometric center of the support surface (110); Two pole holes (12) are provided, and the two pole holes (12) are located on both sides of the support boss (13) along the length direction of the support surface (110).

8. A battery casing, characterized in that, Includes a housing component (20) and a battery cover structure as described in any one of claims 1 to 7 connected to one end of the housing component (20); The cover plate body (11) is integrally formed on one end of the housing part (20), and the other end of the housing part (20) is set as an open opening.

9. The battery casing according to claim 8, characterized in that, A base plate (21) is welded to the opening, and an explosion-proof valve (22) is integrated on the base plate (21).

10. A battery cell, characterized in that, Includes an electrode assembly and a battery casing as described in any one of claims 1 to 9 for accommodating the electrode assembly; It also includes an electrode structure that passes through the pole hole (12), one end of the electrode structure is connected to the electrode tab of the pole group, and the other end protrudes from the support surface (110) at a preset height; the support boss (13) protrudes from the support surface (110) at a height greater than or equal to the preset height.

Images